Staff-lathe.



PLTENTED JUNE 2, 1908.

W. B. MEHL.

STAFF LATHE. APPLIOATION FILED our. 9, 1906.

7 SHEETS-SHEET 1.

Y E N m N A 71015.; 6. W12? l w N a9 6. PATENTED JUNE2 1 08. 8 w. B. MEHL. 9

STAFF LATHE.

APPLIUATION FILED DOT. 9, 1906. 7 BEEETB SHBET a.

WITNESSES:

MTUQN, L

lNVE/VTOR A TTORNEY PATENTED JUNE 2, 1908.

W.B. MBHL. STAFF LATHE.

APPLICATION FILED 00129, 1906.

7 SHEETS-SHEET 3.

/NVENTOR 6 ATTORNEY PATENT-ED JUNE 2, 100a.

STAFF LATHE. AYPLIOATIOI FILED 00T- B 1906.

'! SHEETS-SHEET A.

INVENTOH M B) ML /df ATTORNEY lTNESSES QAN No; 889,886. PATENTED JUNE 2, 1908. W. B. MEHL.

STAFF LATHE.

APPLICATION FILED OCT. 9, 1906.

7 SHEETS-SHEET 6 W/TNESSES PA-TENTED JUNE 2 1908. No 889,386 w B MBHL' I STAFF LATHE. APPLICATION FILED OUT. 9, 1908.

7 SHEETS-SHEET I.

71 BfA/VENTO s /g q M ATTL' Mn UNITED STATES PATENT OFFICE.

WALTER B. MEHL, OF WALTHAM, MASSACHUSETTS, ASSIGNOR TO E. HOWARD WATCH COM- PANY, OF RIVERSIDE, NEW JERSEY, A. CORPORATION OF NEW JERSEY."

STAFF-LATHE.

Specification of Letters Patent.

Patented we 2, 1908.

Application filed was a, 1906'. Serial No. 338,118.

To all whom it may concern: I H

Be it known that I, WALTER B. MEHL, a citizen of the United States, and a resident of Waltham, in the county of-Middlesex and State of Massachusetts, have made and invented certain new and useful Im rovements in Staff-Lathes, of which the to owing is a specification.

My invention relates to an improvement in machines for turning pinions, staffs and arbors, used in watches, clocks and other like mechanism. In stafi' lathes as now ordinarily constructed, it is necessary to remove the article from the machine after making the first cut or forming the first diameter, to then re-adjust the machine, again insert the article, and by the second cut to formdhe second diameter then to remove the article,

re-adjust the machine, and by the third out, form the third diameter, and so on until each diameter has been formed on one half of the pinion, arbor or staff. The article is then removed from the machine and reversed end to end, and the several diameters formed on the second hall of the article,'the latter being removed and the machine re-adjusted after each cut, so that infithe event that three shoulders and diameters are to be cut on each half of the pinion, it is necessary to remove the pinion from the machine and readjust the parts of the latter, five, times during the completion of the pinion.

The object of my present invention is to so construct and arrange the machine that the inion will have to beremoveil from the the athe but once, that is, each half of the pinion will be fully completed Without readjustment of the machine, and without removal from the machine, the only time that such removal becomes necessary being for the reversal of the pinion in the lathe, that is, from end to end. In other words, after the pinion has been inserted in the lathe, one half thereof is completed, the inion then removed and reversed end to en in the machine, andv the second half completed, this regardless of the number of shoulders and diameters to be formed on the pinion:

A further object of my invention is to so construct and arrange the several parts of the machine that if desired, the pinion may be traversed by the cutting tool the second time, the first operation being that of a heavy I tion, that of a finishing cut, to bring the pinion to exactly the proper size or diameter, these two cutting operations being performed, of course, without the necessity of removing the pinion from the lathe.

A further object of my invention is to so construct the machine that the several turnings or diameters on the pinion will be absolutely concentric, and thereby avoid the imerfections present in those pinions made on athes of ordinary construction, and which imperfections arise by reason of the repeated removals and insertions of the inion from and into the lathe, and the rear justment of the latter.

With these and other ends in view, my invention consists in certain novel features of construction and combinations of arts, as will be hereinafter fully describe( and specifically pointed out in the claims.

f In the accompanying drawings, Figure 1 is a plan view of the machine. Fig. 2 is a view in side elevation thereof. Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1. Fig. 4 is a plan view of the machine having one of the-slides removed, and a portion of the bed broken away. Fig. 5 is an enlarged detail view of one portion of the machine, showing the cam and levers for holding the several parts in their different adjustments. .Fig. 6 is a sectional view taken on the line 6-6' of Fig. 5, and looking in the direction of the arrow. Fig. 7 is a sectional view showing the construction and arrangement of cams and cam shaft, and means for drivin the latter. Fig. 8 is a sectional view taien on the line 8-8 of Fig. 7. Fig. 9 is a detachedview of the worm ear, showing the roller-clutch applied t ereto for locking said gear to the cam shaft. Fig. 10 is an enlarged detail view of the clutch. Fig. 11 is a sectional view taken on the line 1111 of Fig. 8.

Fig. 12 is a detached perspective view of the second operaport for the machine, the latter comprising a bed B on or to which is secured the frame C. This frame is provided with thelateral groove or recess in. which reciprocates the slide. D. Over and above the slide D is located the slide F, movin on the base E, forming a part of the slide at right angles thereto, 881d u per slide F carrying the cuttin tool G. 'Fo the frame C is secured the tai and head-stock H, in which are mounted the spindles h for carryin the pinion, staff, arbor, or other article un er operation. By means of'the several adjusting screws 0., the position of the slides and several other portions of the machine may be adjusted.

The several parts above referred to, constitute a part or portion of the wellknown machine ordinarily used for cutting or turning pimons, arbors and staffs, and as anum- I ber ofsuch machines are in daily use and wellknown and understood by those skilled in the art, and as such form no part of the present invention, no further detailed description thereof is necessary.

To the bed of the machine B, is secured the box-like frame 16, as illustrated in Fig. 7 in'the bottom or base of which -is 'ournaled the lower end 17 of the cam sha t 18, the upper end of the latter being provided with the hand wheel 19 for facilitating the turni thereof when necessary.

ithin the box or casing 16, and'resting upon the collar 16, is the worm gear 20, meshing with the worm 21 secured on the shaft 22, the latter extending parallel. to the base of the machine and journaled in the bearings 23, which bearin s are bolted or otherwise secured within t e casing 16, as illustrated in Figs. 7 and 8.

For the urplose of engaging the worm gear 20 wit t e cam shaft 18, I employ roller clutches 24, as illustrated in Figs. 9 and 10, wherein the rollers 25 are employed between said worm gear and shaft for tightly binding the latter to the former, hardened steel lates 26 being located within recesses forme in the shaft to afford a hearing for said rollers 25, the worm gear 20 being provided with a hardened steel ring 27 for formin the outer contact with the rollers 25, this construction and arrangement being preferred in order that said rollers, when in operative engagement with the shaft, shall be prevented from making grooves or indentations in the soft metal of which said shaft and gear are made.

Behind the rollers 25 are located the coiled springs 28, in order to retain said rollers in operative engagement with the shaft and gear.

By means of this construction and arrangement of arts, it will be understood that when motion is imparted to the Worm gear 20 through the worm 21, the clutch will be in operative engagement, and that also when desired, the cam shaft 18 may be rotated in the same direction indepemlently. of the worm 21 .gear 29, meshing with a similar gear 30 mounted on the huh 31) of the cumin)", the latter being rotatalily mounted on the stud 31 extending upwardly from the bottom of the casing 16, as illustrated in Fig. 11 of the drawings, said cam being secured to the spur gear 30 by means of the screw 32, causing said camand gear 30 to rotate together.

vTo the casing 16 is fastened the ca) 33, provided with the sleeve 34 forming a waring for the cam shaft ]8','and on the up )er side of which sleeverests the nut 35 tbreai ed on the shaft 18 and fitting in an opening formed in the cam 36. For the purpose of holding the cam in position, i employ the collar 37 above and'on which is located the cam 38, the latter being held in position by the hand wheel 19 threaded on the shaft 18. Onthe nut 35 is fitted a collar 39, provided with a finger 40, the purpose and function of which will be hereinafter described.

()n the upper side or surface of the. collar 37, is provided the pin or projection 3,7, as illustrated in Fig. 12, and on the under side of said collar is formed a pin or projection 37*, the former of which pins fits in an opening in the cam 38, and the lower of which pins fits in a hole or opening in the cam 36, and extends downwardly into a hole or opening formed in the nut 35, the purpose and result of which is to hold or retain the several cams in their proper relative positions.

With the )eriphery of the upper cam 38, engages the free end of the cam lever 41, fulcrumed on an eccentric sleeve 42 formed on one end of the shifting lever 43, said lever 43 in turn, being pivoted to a bracket 44, secured to the frame of the machine by means of the screws or bolts 45.

On the frame of the machine is located the slide J ada ted to move in a direction parallel with t 1e slide F, such slide J forming part of the ordinary machine, and to which is secured by means'of the screw 46, a bracket. 47. To the bracket 47 is secured the swiveling shoe 48, with which engages the extreme end of the lever 41, as illustrated in Fig. 4 of the drawings.

By means of this construction and arrangement of the several parts, it will be understood that when the free end of the cam lever 41 is moved outwardly by means of the cam 38, the opposite extreme end will be moved inwardly, which, engaging with the swiveling shoe 48, will, through the bracket 47 and slide J, operate to move the slide F in the same direction in which the slide J is.

moved. The slide F is arranged to be moved in the opposite direction by means of springs, constituting part of the ordinary machine, and constructed and arranged in the usual and well known manner, and which retain tached cutter, will effect the second or finishprojection 54 formed on the lever 55, one end 1 depth of the finishing cut on the pinion, arbor its attached cutter, will to the frame of the machine by the bolt 59,

tated. with the shaft 50, the projection 54 is the end of the lever 41 in engagement with the periphery of the cam 38. I As illustrated in Fig. 5, to the frame of the machine isbolted, or otherwise secured, the bracket 49, in which is journaled the shaft 50,,having keyed thereon the ea1ns51-52. \Vith the. )eriphery of the lower cam .51, provided with the recess or depression 51, engages the bent free end 51 of the lever 43, which as before stated, is pivoted to the bracket 44:. As the cam 51 is shifted, ,the bent end 51 of the lever 43 is moved into or out of the recess or depression 51, thereby l causing, by means of the eccentric sleeve bearing 42 thereon, a change in the location of the fulcrum of the lever 41;, and, through the means already referred to, a slight change in the position of the slide F, the distance moved by, said slide F, being equal to the or staff under operation.

In Fig. of the drawings, the lever 43 is shown as havin its bent end engaging the concentric periphery of the cam 51, the dotted lines illustrating the position of the saw eral arts after said cam has been shifted and the ree bent end of said lever '43 allowed to pro'ect into the depression 51".

hen'the parts are in the position as illustrated in full lines in,Fi 5, the slide F with ie in proper position oradjustinent for effecting the first or heavy cut on the pinion or arbor. In Fig. 1, however, the lever 43 is shown ashavin its bent end projecting into the recess 51 o the cam- 51, 1n which position the slide F with its at in r cut on said pinion, staff or arbor.

in the frame of the machine is formed a hole or openin 62, in which is located a spring 63 on which latter in turn rests the p unger 64, said plunger being held tension of said s ring 1n contact with ver 43; the tent ency of this spring is to retain the bent end 51 of said lever 43 in contact with the periphery of the cam 51, and when said cam is shifted as described, to force said bent end into the de ression 51.

With the eriphery o the upper cam 52, provided wit the depression 53, engages the of which is provided with an eccentric sleeve 56, journaled about a stud 57 formed on or secured to the block 58, adjustably secured passing through the elongated slot formed in said frame, as illustrated in Figs. 5 and 6.

"To the opposite end of the lever 55 is secured one end of the spring 61, the opposite end of the s ring being secured to the bracket 44, the tendency of said spring being to keep the projection .54 formed on the lever 55, in engagement or contact with the eriphery of the cam 52. As the cam 52 is s ifted or rob the r the lecaused to ride out of the recess 53, and when returnedto'lts normal position, the tendency of the sprin 61 will be to cause said projection54 on the lever 55 to enter the recess 53, as illustrated in Fig. 5, the several cams and levers being so arranged that when the pinion, staff or arbor is being first cut, the projection 54 on the lever 55 will rest within the depression 53, while the free bent end 51 of the lever-43 will rest on the concentric peripher of the cam 51. When these cams are shifter however, to effect the finishing ,cut, the projection 54 will ride out of the depression 53 formed in the periphery of the cant 52, as illustrated in dotted lines in Fig. 5, and the free bent end 51 of the lever 43 will ride into the depression .51 formed in the periphery of the cam 51, as illustrated in dotted lines in said Fig. 5. l Inorder to move the earns 51 and 52, which are of course shifted simultaneously, I provide a handle orlever 65, secured to one end of the shaft 50, to which said cams are attached.

To the slide D is pivoted the swiveling shoe K forming part of the ordinary ina- Ichine, andv against which shoe bears the extreme end of the lever 66, this end of the le. ver being provided with the hardened steel contact plate 67 secured to said lever by means of the screws 68, as illustrated in Fi 5 of the drawings, said lever 66 being fu lcrume d on the eccentric sleeve 56 formed on or secured to the lever 55, as before described. The 0 osite free end of the lever 66, as illustratet in Fig. 4, engages the periphery of the cam 36, both of said levers 41 and 66 emfiloyed to operate or move the slides F and respectively, being provided with rollers 69, in order to reduce the frictional contact of their free ends with the peripheries of their res ective cams.

0 support the weight of the levers 41 and 66, I provide the post or pedestal 70, the lower end. of which is secured to the bed or frame of the machine, and the upper end provided with outwardly extending arms 71, on which said levers rest as'indicated in the several fi ures of the drawings. As the cam 36 is shifted or rotated, the free end of the lever 66 is moved outwardly, as illustrated in Fig. 1, and the opposite extreme end thereof moved inwardly, whichin turn bearing against the swiveling shoe K, connected with the slide- D, moves the latter in a corresponding direction. Bearing against the opposite end of the slide D is the spring 1.1, forming a part of the ordinary machine, the tendency of which spring is to return said slide in a direction opposite to thatcaused bythe'lever 66, and retain the free end of said lever 66 in contact with the periphery of the cam 36.

When the cam 52 is shifted from the position as illustrated for instance in Fig 5, the projection 54 on the lever 55 is caused to ride up out of the depression 53 onto the peripher of the cam 52, and by reason of the fact t at the lever 66 is mounted or fulcrumedon the eccentric sleeve 56 formed on or secured to the lever 55, the fulcrum of the lever 66 is changed or altered as in the case of the lever 41 before described.

From the foregoing it will be understood that when the shaft 50 is partially turned or rotated by means of the handle or lever 65, both cams 51 and 52 are also partially rotated, thereby changing the fulcrums of the levers 41 and 66 with relation to the slides F and D,f0rcing each of said slides a slight dis- .tance forward when changing the levers from the normal positions asillustrated in Fig. 5, to the positions as illustrated in Fig. 4, the several springs hereinbefore referred to, causing the respective slides to return to their normal positions as illustrated in Fig. 5 when the handle or lever 65 is returned to its normal position.

To automatically stop the machine after com leting one revolution of the cams 36 and 38, employ the finger 40 formed on or secured to the collar 39, hereinbefore referred to, the outer end of said finger engaging with the lever 72 fulcrumed to a stud 73 formed on or secured to the bed B of the machine, as illustrated in Fig. 13 of the drawings.

When the lower end of the lever 72 is moved outwardly, as illustrated in dotted lines, the extreme lower end thereof is released from engagement with the end'of the lever 74, fulcrumed at 74, the op osite end of which latteLis adapted to shif f the belt from a tight to a loose pulley. When the finger 40 passes the lever 72, the latter is returned to its normal position by means of the sprin 75, one end of which is connected with the fiower end of said lever 72 and the opposite end to a pin or stud secured to the bench or table A. This tripping mechanism, of course, may be modified or altered as desired, and forms no part of my invention, some form thereof being used for the purpose of automatically stopping the machine after the cams 36 and 38 have made one complete revolution. 1

On the up er or cam edge of the cam 30*, engages a ro l or trunnion 77 secured to one end of the lever 78, which lever is fulcrumed and pinned tightly to the shaft 79, the opposite end of said lever 78 engaging with one end of the lever M, which in turn is fulcrumed at N in the frame of the machine, as illustrated in Fig. 3. On the opposite end of the lever M rests one end of the spring actuated plunger O, the upper end of said plunger engaging with one of the spindles as in the case of the ordinary machine for binding said spindle it against lateral movement when the cut is being made on the arbor or stafi. On

the opposite end of the shaft 79 is pinned or i otherwise secured, the lever 80, the free end of which engages one end of the lever P also fulcrumed in the frame of the machine in a similar manner to the lever M, before described, and also engaging with a spring actuated plunger Q, which latter in turn engages with the other of said spindles h to hold the same against lateral movement while the arbor or staff is under operation.

As in the case of the machine as ordinarily constructed, when the roller or trunnion 77 rides into the depression 81 formed in the cam 30*, the s indles h are released from engagement with the plungers O, Q, and allowed lateral movement in their bearings, and when said trunnion rides out of said depression on said cam 30*, the plungers are raised into engagement with the spindles and hold the same tightly against endwise or lateral movement as hereinbefore described, the arbor or staff being thereby held stationary while the cut or cuts are being made thereon or therein by the tool G.

Motion is imparted to the machine through a belt (passing over the pulley R secured to the en of the shaft 22, which through the worm 21 and worm gear 20, imparts its motion to the cam shaft 18, and through the latter to the cams-38, 36. As these cams rotate, the levers 41 and 66 cause the slides F and D to move in directions and to an extent as determined b the cam surfaces, thereby causing the cuttlng tool to travel in a corresponding direction, and to.form the different diameters and shoulders on the pinion, arbor or staff under operation, the cam 38 and lever 41 actuating the slide F, and the cam 36 and lever 66 actuating the slide D.

When the cam 36 and lever 66 cause the slide D to travel laterally, the cutting tool G is caused to travel in a corres onding direction, as between shoulders on t e pinion, and when the cam 38 and lever 41 actuate the slide F, the cutter is caused to move in a direction at ri ht angles to the axis of the pinion until suc time as the cam 36 and lever 66 again come into operation.

In Fig. 14 I have shown two cams having proper outlines, whereby to roduce an arbor aving the diameters and s oulders as illustrated in Fig. 15.

It will of course be understood, that the outlines or peri heries of the cams 36 and 38, are so varied, c anged or altered as to correspond with the diameters and shoulders to be formed on the pinions or arbors, and are so arranged with relation to each other that while one cam with its respective lever is o crating to move its respective slide, t e other cam and lever with its respective slide is at rest. For instance, in forming the diameter w on the pinion X, that portion of the geriphery of the cam 38 between the oints and O is concentric while that portlon of the periphery of the cam 36 between B and C is eccentric, causing the cutter to travel in If, however, the diameters and shoulders on a line parallel to the axis-of the )inion. tween the points C and l) on t. 1e periphery of the cam 38, there is an eccentric rise, causing the cutter to recede from the pinion, while the ptriphery of the cam 36 between the points and l) is concentric, thereby forming the shoulder 1: on the pinion. 'lhe cutter is next caused to travel parallel to the axis of the pinion by reason of the fact that between the points l) and E on the periphery of the cam 36, there is an eccentric rise,'while the periphery of the cam 38 between the points i) and i5, is concentric, therebv forming the diameter .r" on the pinion. Between the points-ii and F the cam 38 becomes active by reason of the eccentric rise on its periphery. and the cam' 36 be comes inactive by reason of its concentric periphery between said )oints E and F, therebv forming the shouider X on the pinion. lletween the points F and (l' on the. periphery of the -am 36, there is an eccentric rise causing the cutter to travel parallel with the axis of the pinion, forming the diameter :1 thereon, the periphervtot the cam 38 between said points F and (l being concentric.

Between the points (t and ii on the cam 36, the periphery is concentric,while between the same points on the cam 38, there is an cecentric rise, forming the shoulder on the pinion.

Between the points ll and A on the cam 36, there is an eccentric rise, and on the eriphery of the. cam 38 between said points '1 and A', there is also an eccentric rise, which bring into simultaneous operation the. two slides, whereby is produced the bevel in" on the )inion.

The tripping mechanism before described, then causes the belt to be shifted from the tight'to the loose pulley, the momentum of the machine causing the cams'to travel to a point about midway between the points A and B on the two cams 36and 38, leaving one or both spindles it released from engagement with the plungers O and Q, as before described, this release being caused by the trunnion 77 on the lever 78- riding into the" dc ression S1 in the cam 30" y moving the handle or lever 65 and shifting the. cams 51 and 52 as before described, the slides D and F .are slightl moved forward, the machine isagainstarte and the same operation repeated, the cut, however, which is the finishing out, being of less depth 'b reason of the ehan e in the position of t e slides, as hereinbe ore fully described. The pinion, after having onehalf thereof completed, may then be removed from the machine and reversed endto end, and if the diameters and shoulders are to corres ond with those already formed on the first alf, the same cams 36 and 38 may be allowed to remain in the machine.

Bethe second half of the pinion are of a different relation to those cut on the first half, the cams 36 and fiR-are removed and other cams having proper outlines, substituted therefor.

From the foregoing it will be understood that any number of shoulders and diameters may be formed on a pinion or arbor, the relations between them being fixed or determined by tlte outlines or peripheries of the" cams 36 and 3h.

it will also be understood that by reason of the employment of camsto operate the several slides carrying the cutting tool, the necessity of removal of said pinion, arbor or staff from the machine, after each diameter or shoulder has been cut, is avoided, said pinion, arbor or staff being allowed to remain in its proper adjustment and position within the machine until one half thereof has been completed,thereby insuring the accurate concentric cuttings of its different diameters and proper relations of shoulders. llurthermore, my improved attachment permits of a first or heavy cut, and a second or finished cut, whereby absolute certaint in size of the several diameters is accmnplisli ed, and this without the necessity of removing the pinion from its first properly adjusted position within the machine, it being a well nown fact that if one heavy cut be made,

there is more orles's danger of the pinion, arbor or staff being sprung or bent under the cutting strain. Furthermore, by reason of the ratio between the lengths of the longer and shorter arms of the levers 41 and 66, the distance traveled by the shorter arms of said levers is much less than that traveled by the longer arms thereof, the consequence being that should therebe any error in the outlines of the peripheries of the cams 36 and 38, such errors in the finished product will be materiall reduced;- in fact, in those machines which now have 'in o eration, the ratio between the lengths of t 1e longer and shorter arms of thelever 41 is approximately ten to one, so that should any error occur in the outline of the cam 38, such error in the finished product will be one-tenth of that occurring on the cam. The ratio existing between the length of the longer andshorter arms of the levels 66 is five to one, so that an error in the outline of the cam 36 will be reduced to approximately one-fifth of such error in the nished pinion or arbor.

Havin fully described my invention, what I ci a Letters Patent, is

1. In a staff lathe, the combination with two slides placed one above the other and carrying a cutter and arranged to move inim as new and desire to secure by dependently of each other, of a cam lever engaging said slides and fulerumed on an eccentric, and rotating cams engaging said lever for operating said slides, substantially as described.

2. In a staff lathe, the combination with two reciprocating slides placed one above the other and carr ing acutter and arranged to move indepen entl of each other, of a cam lever engaging can of said slides and each fulcrumed on an eccentric, and rotating cams engaging said levers for operating said slides, substantially as described.

3. In a staff lathe, the combination with reciprocating slides placed one above the other and carrying a cutter and arranged to move independently of each other, of cam levers fulcrumed on eccentrics and having their shorter arms engaging with slides, and rotating cams engaging the longer arms of said levers for operating said slides, substantially as described.

4. Ina staff lathe, the comblnation with reciprocating slides placed one above the other and carrying a cutter and arranged to move independently of each other, of cam levers mounted on movable fulcrums and engaging said slides, and rotating cams engagmg said cain levers, substantially as described.

5. In a stafl' lathe, the combjnation with reciprocating slides placed one above the other and carrying a cutter and arranged to move independent] of each other, of cam levers eng provided w th eccentrics on which said ing said slides, shifting levers cam levers are fulcrumed, rotating cams ening said shifting levers, substantially as de-' scribed.

-6. In a staff lathe, the combination with spring actuated reciprocating slides placed one above the other and carrying a cutter and arranged to move independently of each other, of shifting levers, cam levers eccent-rically fulcrumed on said shifting levers, cams engaging said shifting levers, and rotating cams engaging said cam levers for operating said slides, substantially as described.

7. In a statl lathe, the combinationwith two slides placed one above the other and carrying a cutter and arranged to move independently of each other, of cam levers for moving said slides in one direction, springs for moving said slides in the opposite direction, shifting levers provided with eccentrics on which said cam lcvers'arc illlcrmnetl, cams engaging said shifting levers, and means for moving said cams, and rotating cams engaging said cam levers for operating said slides, substantially as described.

Signed at New York, borough of Manhattan, in' the county of New York, and State of New York, this 21st day of September, A51). moo.

'1' tnesses i M. VAN honrwrcrc, N. B. Smrrn. 

